Electrical terminal bushing



Dec. 28,1948. ETHERT- 2,457,535

ELECTRICAL TERMINAL BUSHING Filed July 20, 1944 Paten ted Dec. 28, 1948 U NIT ED STATES F jF lCiE ELECTRICAL TERMINAL BUSHING "Russell '8. ,Diethert, Chicago,-2lil., assig'nor 'rto Northwest-Plastics, Inc., St. Paul, Minn.,'-.a :cor-

poration of Minnesota Application July 20, 1944, Serial No. 545,841

lzolaims. (Cl. 174-153) This invention relatesto an electrical terminal bushing adapted to be used as an electricalconductor for an electrical capacitator or condenser or as an electrical terminal alone.

Thiselectrical terminal bushing and condenser means extending through the same may be used on containers'that'have a vacuum or wherein a pressure is formed in the container, or it may be used in a liquid container where electrical conduct-or means are desired to be;hermeticallyrsealed and passed through the wall rofrthe-container.

A featureresides in providing an electrical terminal bushing with conductor means, which bushing is adapted to be adjustable for sealing the condenser and after the condenser is sealed. This adjustable means isprovided by a threadforrned on the bushing which cooperates witha nut to draw the bushingtautwhen it is attached toithe wall of the container. .It is very desirable that 'an electrical terminal bushing'of this-character be adjustable to be fitted to the wall of thereontainer beforethe same issealed andevenafter the container. is, sealed, i-t. sometimes becomes idesirable to adjust the bushing terminal :to-cause a, hermetical sealingof the container :around the terminal. "This can be readily accomplished by an :adjustablenut whichis threaded to:the':body

of the insulatingbushing.

It is also a feature to provide an electrical terminal'gbushing which can be molded fromzvarious r types of plastic .material, :which may include ceramics, rubber compounds, cellulose acetate, plastics or other phenolic plastics, or any other type of molding compound which may be desirable for use in a bushing of this character.

Furthermore, this electrical terminal bushing may be used on relays, transformers, vibrators, and to provide an electric feed through the insulating bushing with a hermetically sealed electrical terminal means extending through the bushing. It will be apparent that this bushing and terminal may be used on containers of metal, glass, fibre, paper, or plastic containers, and it is of primary importance that the sealing of the bushing in relation to the container may be adjusted by the thread and other means provided so that after the gaskets used about the bushing have set or shrunk, the sealing of the bushing may be adjusted by the lock nut provided for this purpose.

In the drawings forming a part of the specification:

Figure 1 is a plan view of electrical transformer or condenser.

Figure 2 is a side view of the same, a portion 2 of whichis broken awayto illustrate myue'lectrlcal terminal bushing extending through the Mall of'the same.

Figure 3 is a side elevation of my electricallterminal bushing.

:Figure 4 is asection on theline ll of Fi ure 3.

Figure 5 is a section on the'line .5--5;of=Fig- 'ure-:4.

The drawings .illustrate the transformer v:or condenser A in which myv electrical terminal bush- .ingiB is: adapted to be sealed.

The electrical terminal bushing Bis formed witha non-metallic plasticibody I0 vwhichrrnay be molded into anysuitable plasticmaterial and is ,formedwith ashoulder II on one end and a threaded shank I2 formed on the other end.

,Arlock nut I3 is provided forlocking electrical terminal bushingto-the wall I4 of the transformer or condenser or other electrical qunit,

wherein a terminal of this characterisdesired.

Suitable gasket means I5 may be employed radjacent the shoulder II and beneath .themut :I3. The shank of ,the bushing:may be j locked and hermetically sealed to the wall I4 .of '.the .con-

tainerA.

In forming :the non-metallic plastic body III, which is adapted to be molded in suitablerdies .(not illustrated) formakingthe same,;it.isr'rle- :sirable to:simultaneously-moldelectrical terminal means I6.

The electrical .terminals :I61may ;be in any suitable form and are adapted to project through the bushing I0 with the ends projecting from either end of the bushing. The terminals I6 may be flat in formation, or of any other desirable shape, and the portion between the ends of the terminal are preferably serrated at IT. The serrated portions I I of the terminal I6 are adapted to be anchored and molded on the body I0. These serrations assist in locking and sealing the terminal I6 in the body ID of the bushing.

In forming the bushing, it is also desirable to form insulating bosses I8 extending longitudinally of the terminals I6 and projecting from either end of the bushing, thus extending the insulating means to the desired extent along the electrical terminals so as to increase the insulating properties of the bushing and to strengthen the sealing means of the bushing.

My electrical terminal bushings may be made in small minute formation or in larger formations as may be desired, and one or more electrical terminals may be formed or molded in the bushing to fulfil the requirements of an electrical conductor and bushing of this character. This electrical terminal bushing and conductor has been found to be very desirable for use by the government with electrical apparatus, and in tests, the insulating properties between the terminals have proven very satisfactory.

Furthermore, this electrical terminal bushing is desirable because it can be assembled to the wall of the container and sealed thereto by the locking nut 13, and after the container has been sealed, this terminal bushing can be adjusted to more effectively seal the same and to lock the sealing nut I3 by soldering the same at the edges of the nut at 20, if it is desired, thus locking the nut rigidly in place after it has been finally ad- Justed in the desired locking position.

I claim:

1. An electric terminal of the character described including, the elongate flat-strip-like conductor elements, transverse serrations formed on the flat opposed side faces of said conductor elements, a non-metallic plastic body of insulating material molded about and between said conductor elements intermediate the ends of the latter and extending into said serrations so as to prevent relative longitudinal movements between said conductor elements and body, said body being formed with flat parallel ends and a flanged end and an externally screw-threaded surface, and means threadedly engaged with the externally threaded surface of the body.

2. An electrical terminal comprising a body of non-conducting material, fiat sided conductor elements molded in said body extending outward from each end of said body and spaced near the periphery thereof, serrations formed transversely on the flat sides of said conductors, filleted bosses on each end of said body thru which the conductor elements extend, one end of said body having threads, the other end having a shoulder, means for threadedly engaging the threads of said 1 body whereby said terminal may be inserted into an opening in a container and adaptably secured by said means.

3. An electrical terminal including a cylindrical body of non-conducting material, fiat sided conductor elements molded in said body extending outward from each end of said body and equally spaced apart and positioned near the periphery thereof, V-shaped serrations formed transversely on the flat sides of said conductors thruout the portion embedded in said body, filleted bosses surrounding each end of said conductors at the point of exposure of the conductors extending out of said body and shaped to said conductors one end of said body having threads, the other end having a shoulder, a nut threadedly engaging the threads of said body whereby said electrical terminal may be locked into position when extending thru the wall of a container adapted to be secured by said nut.

4. An electrical terminal including a threaded cylindrical body, a washer-like shoulder formed integrally on one end of said body, a series 0! three fiat electrical conductors adapted to be molded into said body with their ends projecting therefrom, serrations formed transversely in the broad flat surfaces of said conductors to firmly anchor each conductor in said body, said conductors being spaced apart and positioned near the outer surface of said body to give a wide electrical gap between each of said conductors, and nut means for locking said electrical terminal to a wall of a container whereby the inner ends of said conductors are positioned within the container and the outer ends of said conductors are exposed on the outside of the container.

RUSSELL S. DIETHERT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS FOREIGN PATENTS Country Date Great Britain Oct. 18, 1923 Number Number 

